# A377115 (b-file synthesized from sequence entry) 0 0 1 1 2 6 3 36 4 216 5 1304 6 7920 7 48320 8 295680 9 1812672 10 11124864 11 68320000 12 419719680 13 2579051008 14 15849305088 15 97406521344 16 598661038080 17 3679444570112 18 22614556631040 19 138994100486144 20 854291341737984 21 5250689954316288 22 32272093691707392 23 198352703517884416